Jet Research Center Drill Collar Severing Tool P/N 101293224 Rev. K
Page 13 of 20
Jet Research Center, 8432 South I-35W, Alvarado, Texas, 76009-9775, USA
Telephone 1-817-761-2000; Toll Free 1-800-451-5403; Fax 1-817-783-5812; Website www.jetresearch.com
5. Arming and Deployment Procedures with Electric Detonators
The term ‘SAFE’ when used in this document is referring to a combination of actions that
are designed to render the initiating system incapable of sending power to the electric
detonator. These actions typically involve the shorting of the mono-conductor wireline
conductor to ground via a power resistor (for multi-conductor the conductors are connected
to one another and ground via power resistors); a key system which prevents the initiating
system from connecting power to the electric wireline; and disconnecting power to the
initiating system. The key is held outside the unit and visible until the explosive assembly is
safely 200 ft (70 m) below ground level or the sea bed; or the cutter and detonator have
been removed and returned to storage.
The term ‘Radio Silence’ is used to refer to the combination of actions which involves the
shutting down of radio frequency transmissions within 1000 feet (305 m); the shutting down
and isolating of electric welding equipment and active cathodic protection.
The Drill Collar Severing Tool may use a resistorized detonator, which reduces the
possibility of accidental firing by stray current, or a Top Fire RED detonator; that provides
additional safety enhancements when compared to conventional resistorized detonators.
Note that each detonator requires the use of a different adapter sub (item 17). All previously
established safety rules and regulations should be maintained during the assembly of
explosives.
Note: Refer to Drawing D00051806 and Table 4 in Section 7.
5.1 Ensure all required materials are identified and on hand before proceeding but keep
the explosive items in safe storage until after the safety precautions are in place.
Ensure that the wireline has been put into ‘SAFE’; and that ‘Radio Silence’ (not
required if using RED) and all other safety procedures previously stated are in place
before handling the explosive components.
5.2 Check the insulation and continuity of the firing head (19) and the extension
mandrels (10). Refer to Table 3 below for appropriate parts.
WARNING
CCL SHOULD BE CHECKED OUT PRIOR TO OFF-LOADING EXPLOSIVE
ASSEMBLIES. TURN OFF ALL RIG RADIOS, ARC WELDERS AND
CATHODIC PROTECTION DEVICES BEFORE ASSEMBLING. BE SURE
CABLE IS IN SHORT OR SAFE POSITION AND PERFORATING UNIT’S
POWER PLANTS ARE TURNED OFF. MEASURE STRAY VOLTAGES
BETWEEN PERFORATING UNIT TO GROUND, RIG TO GROUND AND
WELLHEAD TO GROUND, ENSURING NO STRAY VOLTAGES ARE
PRESENT. PLACE A GROUNDED LOOP BETWEEN PERFORATING UNIT,
RIG, AND WELLHEAD.
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